The Zhongtiaoshan region in Shanxi Province is an important copper metallogenic belt in China, which hosts the Hujiayu porphyry copper deposit and the ‘HujiayuBizigou’type copper deposit.In this paper, we analyzed the helium and argon isotopic compositions of fluid inclusions from pyrite and chalcopyrite in Tongkuangyu and pyrite in Hujiayu.For the Tongkuangyu deposit, 4 He content of fluid inclusions ranges from 46. 23×10 -8 cm 3 STP/g to 1195. 75×10 -8 cm 3 STP/g, with 3 He/ 4 He ratios between 0. 01 Ra to 0. 06 Ra; 40 Ar content varies from 1. 69×10 -8 cm 3 STP/g to 74. 11×10 -8 cm 3 STP/g, with 40 Ar/ 36 Ar ratios of 407 to 2327. 8.For the Hujiayu deposit, 4 He content, 3 He/ 4 He ratios, 40 Ar content and 40 Ar/ 36 Ar ratios range from 314. 06×10 -8 cm 3 STP/g to 3815. 87×10 -8 cm 3 STP/g, 0. 003 Ra to 0. 014 Ra, 25. 62×10 -8 cm 3 STP/g to 761. 51 ×10 -8 cm 3 STP/g and 963. 1 to 4108. 6, respectively.The 3 He/ 4 He ratios of the Zhongtiaoshan copper deposit show typical feature of crustal He.The mantlesourced He contents of samples in the Tongkuangyu and Hujiayu copper deposits range from 0 to 0. 56%, contribution of which to mineralizaiton can be ignored.The diagrams of 40 Ar/ 36 Ar vs.R/Ra as well as 40 Ar * / 4 He vs.R/Ra show that all the samples fall into the crustal source area, suggesing Ar crustal origin.Therefore, the largescale copper mineralization in the Zhongtiaoshan region resulted from crustal fluid, without involvement of mantle fluid into mineralization.